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Caliper piston boot #5388745 03/29/20 03:25 PM
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painfx Offline OP
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What do you guys use to lube the caliper piston's boot with? Silicone like 3M or the purple stuff from Permatex?

Re: Caliper piston boot [Re: painfx] #5388754 03/29/20 03:42 PM
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gathermewool Offline
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Boots don't need lubrication.


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Re: Caliper piston boot [Re: painfx] #5388771 03/29/20 04:07 PM
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Silicon spray will keep boots nice and soft!

Re: Caliper piston boot [Re: painfx] #5388802 03/29/20 05:03 PM
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On rubber parts , ALWAYS silicone grease or spray, never petroleum based as the latter can and will cause swelling and eventual failure.


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Re: Caliper piston boot [Re: painfx] #5389072 03/30/20 03:51 AM
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Originally Posted by painfx
What do you guys use to lube the caliper piston's boot with? Silicone like 3M or the purple stuff from Permatex?


Yes!


Retired 6 yrs now & lovin' it
-----------------------------------

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Re: Caliper piston boot [Re: Boomer] #5389142 03/30/20 07:22 AM
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Donald Offline
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Originally Posted by Boomer
On rubber parts , ALWAYS silicone grease or spray, never petroleum based as the latter can and will cause swelling and eventual failure.


Unless its neoprene.


2015 Ford F-250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)
Re: Caliper piston boot [Re: painfx] #5389819 03/30/20 11:35 PM
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painfx Offline OP
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So by applying silicone (3M) on the surface of the piston's boot, would it be a problem if somehow the silicone gets past the boot and contaminate the brake fluid?

Re: Caliper piston boot [Re: painfx] #5390003 03/31/20 08:21 AM
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Donald Offline
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As has been said, boots do not need lubrication. You can use brake fluid as a lubricant to slide the boot in place so it does not tear.


2015 Ford F-250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)
Re: Caliper piston boot [Re: Donald] #5390402 03/31/20 06:41 PM
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painfx Offline OP
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Originally Posted by Donald
As has been said, boots do not need lubrication. You can use brake fluid as a lubricant to slide the boot in place so it does not tear.


How do you prevent the caliper piston to not seize and the rubber boot not rotting?

Re: Caliper piston boot [Re: painfx] #5394646 04/05/20 03:31 PM
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Toyota Rubber Grease is compatible with glycol base brake fluids.

Re: Caliper piston boot [Re: painfx] #5394728 04/05/20 04:59 PM
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Originally Posted by painfx
What do you guys use to lube the caliper piston's boot with? Silicone like 3M or the purple stuff from Permatex?


I presume the brake piston has been removed from the caliper because the boot was old or torn and needed to be replaced.. If that's not the case, disregard the following. You need to slide the new boot over the piston until the boot locks into the seal groove. I lube the piston very lightly with Sil-Glyde before I slide the boot over it and then lube the piston again before installing it into the caliper. If you are asking about conditioning the outside of the boot that's not necessary and may do more harm than good.

Re: Caliper piston boot [Re: painfx] #5394929 04/05/20 08:46 PM
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painfx Offline OP
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Awesome. Thanks for the responses.

I guess there is no way to prevent it, but only replace the caliper when it fails..

Re: Caliper piston boot [Re: painfx] #5395116 04/06/20 03:12 AM
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vavavroom Offline
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Originally Posted by painfx
Awesome. Thanks for the responses.

I guess there is no way to prevent it, but only replace the caliper when it fails..


Boot failure does not mean you need a new caliper right away. If the boot tears the exposed part of the brake piston will over time show signs of corrosion. This is not a prob;em as long as the pads wear and the piston keeps coming out farter and farther. When it's time to replace the pads and you push the brake piston back in that's when you mess up the brake piston seal because you force the corroded piston back in. If the brake piston boot is torn, you need to rebuild the caliper before you install new pads.

1. remove the piston and clean it. If too corroded replace it. Usually they are not very expensive.
2.. Replace the brake piston seal. An inexpensive part.
3. Replace the brake piston boot. Also inexpensive. A caliper rebuild kit comes with seal and boot.
4. Push the brake piston back into the caliper. For rear brakes you will need a proper piston reset tool or you can get creative. The brake tool kit is maybe $50 but you can also rent one from your local auot parts store.
5.. Install new pads, shims etc
6. Bleed brakes. install speed bleeders and use a vacuum or pressure bleeder or ask a friend to help.

If that's too much work you can just buy a rebuilt ot new caliper but where's the fun in that? And I have come up with one product that may prolong the life of the brake piston boot. I don't see why 303 Aerospace Protectant would not extend the leife of the boot somewhat. It's a pretty effective protectant for plastic and synthetic and natural rubber.

Re: Caliper piston boot [Re: vavavroom] #5395395 04/06/20 11:23 AM
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painfx Offline OP
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Originally Posted by vavavroom
Originally Posted by painfx
Awesome. Thanks for the responses.

I guess there is no way to prevent it, but only replace the caliper when it fails..


Boot failure does not mean you need a new caliper right away. If the boot tears the exposed part of the brake piston will over time show signs of corrosion. This is not a prob;em as long as the pads wear and the piston keeps coming out farter and farther. When it's time to replace the pads and you push the brake piston back in that's when you mess up the brake piston seal because you force the corroded piston back in. If the brake piston boot is torn, you need to rebuild the caliper before you install new pads.

1. remove the piston and clean it. If too corroded replace it. Usually they are not very expensive.
2.. Replace the brake piston seal. An inexpensive part.
3. Replace the brake piston boot. Also inexpensive. A caliper rebuild kit comes with seal and boot.
4. Push the brake piston back into the caliper. For rear brakes you will need a proper piston reset tool or you can get creative. The brake tool kit is maybe $50 but you can also rent one from your local auot parts store.
5.. Install new pads, shims etc
6. Bleed brakes. install speed bleeders and use a vacuum or pressure bleeder or ask a friend to help.

If that's too much work you can just buy a rebuilt ot new caliper but where's the fun in that? And I have come up with one product that may prolong the life of the brake piston boot. I don't see why 303 Aerospace Protectant would not extend the leife of the boot somewhat. It's a pretty effective protectant for plastic and synthetic and natural rubber.


I think I will just grease the caliper's pistons lightly with the Permatex 24125 Ceramic Extreme Brake Parts Lubricant. To prevent rust. I think using the 303 Aerospace Protectant won't do much since it will be in a dusty/dirty environment.

https://www.amazon.com/Permatex-24125-Ceramic-Extreme-Lubricant/dp/B0018PSASU

Re: Caliper piston boot [Re: painfx] #5396371 04/07/20 11:54 AM
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Yah-Tah-Hey Offline
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Originally Posted by painfx
Originally Posted by vavavroom
Originally Posted by painfx
Awesome. Thanks for the responses.

I guess there is no way to prevent it, but only replace the caliper when it fails..


Boot failure does not mean you need a new caliper right away. If the boot tears the exposed part of the brake piston will over time show signs of corrosion. This is not a prob;em as long as the pads wear and the piston keeps coming out farter and farther. When it's time to replace the pads and you push the brake piston back in that's when you mess up the brake piston seal because you force the corroded piston back in. If the brake piston boot is torn, you need to rebuild the caliper before you install new pads.

1. remove the piston and clean it. If too corroded replace it. Usually they are not very expensive.
2.. Replace the brake piston seal. An inexpensive part.
3. Replace the brake piston boot. Also inexpensive. A caliper rebuild kit comes with seal and boot.
4. Push the brake piston back into the caliper. For rear brakes you will need a proper piston reset tool or you can get creative. The brake tool kit is maybe $50 but you can also rent one from your local auot parts store.
5.. Install new pads, shims etc
6. Bleed brakes. install speed bleeders and use a vacuum or pressure bleeder or ask a friend to help.

If that's too much work you can just buy a rebuilt ot new caliper but where's the fun in that? And I have come up with one product that may prolong the life of the brake piston boot. I don't see why 303 Aerospace Protectant would not extend the leife of the boot somewhat. It's a pretty effective protectant for plastic and synthetic and natural rubber.


I think I will just grease the caliper's pistons lightly with the Permatex 24125 Ceramic Extreme Brake Parts Lubricant. To prevent rust. I think using the 303 Aerospace Protectant won't do much since it will be in a dusty/dirty environment.

https://www.amazon.com/Permatex-24125-Ceramic-Extreme-Lubricant/dp/B0018PSASU

I don't think the Permatex product mentioned above is compatible with DOT 3/4 brake fluid and NOT intended to lubricate caliper piston seals.

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